Image: Yerkes 40 inch Refractor Telescope-1897
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Description: en:Yerkes Observatory, 40-inch equatorial refractor, en:Alvan Clark and Sons, en:Cambridgeport, Massachusetts, 1897.
Title: Yerkes 40 inch Refractor Telescope-1897
Credit: Originally from en.wikipedia; description page is/was here.
Author: Unknown authorUnknown author
Permission: PD-OLD.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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